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How do I figure these all out?

Classify the following reactions as a precipitation reaction, acid-base reaction, oxidation-reduction reaction, combustion reaction, synthesis (combination) reaction, decomposition reaction, and/or double displacement reaction. Note all that apply.

1) 2Cu(s) + 3I2(s) ---> 2CuI3(s)

2) Na2O2(s) ---> 2Na(s) + O2(g)

3) K2CO3(aq) + CaCl2(aq) ---> CaCO3(s) + 2KCl(aq)

4) HF(aq) + NaOH(aq) ---> NaF(aq) + H2O(l)

5) 4K(s) + O2(g) ---> 2K2O(s)
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It's been awhile since I've been in chemistry, but I found a site that may be able to help you out.

Oxidation-Reduction is also known as Redox

Check out the site, see if it helps. If that doesnt help, Im sure there are tutors who may be able to help.
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1) 2Cu(s) + 3I2(s) ---> 2CuI3(s)  synthesis     2 elements combined to make a compound

2) Na2O2(s) ---> 2Na(s) + O2(g)  decomp   a compound decomposed into its components

3) K2CO3(aq) + CaCl2(aq) ---> CaCO3(s) + 2KCl(aq)  precip      2 liquids combined and a solid appeared

4) HF(aq) + NaOH(aq) ---> NaF(aq) + H2O(l)   neutralization   acid and base reaction

5) 4K(s) + O2(g) ---> 2K2O(s) synthesis      2 elements combined to make a compound
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